Thermowells provide separation from Zone 0/1 or 20/21 and protection of
thermo elements from mechanical, chemical, or physical damage during immersion,
allowing long-term use of the sensor.
They can be made from tube or solid bar, depending on the process
conditions and the Atex Zone where the thermometric complexes are to be
Standard materials used: SS 304, 321, 310, 316,
446, INCONEL600, HASTELLOY, ECC Thermowells made from pipe are used when
stresses or pressures are not very influential and where the required length is
considerably extended. Thermowells made out of a solid bar are used
when the thermo element is subjected to high pressure or
chemical/physical/mechanical stresses due to heavy-duty processes.
In both types, for installations in Atex zones,
it is necessary to guarantee the wall thickness such as:
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